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Editorial Team
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Asked: 2026-06-06T09:10:42+00:00

I’m trying to write an macro: #define FCT( x ) fct( ($ ## x),

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I’m trying to write an macro:

#define FCT( x ) fct( ($ ## x), (@ ## x).first_line, (@ ## x).first_column )

The output of the macro should look like in this example:

FCT(2) --> fct( $2, @2.first_line, @2.first_column )

Unfortunately this doesn’t work, the @ seems to lead to errors. Is this even possible with the C preprocessor?

At the moment I am using this macro:

#define FCT(x,y) fct( x, y.first_line, y.first_column )
FCT($2,@2) --> fct( $2, @2.first_line, @2.first_column )

That works and is short enough for me, but I asked me if the first macro is somehow possible.

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1 Answer

  1. Editorial Team

    In fact, MSVC accepts $ as a valid symbol for identifiers. As it was correctly stated above this should not be so according to the standard. The @ is a preprocessor operator that should normally be applied to parameters of the macro. You cannot use it as part of an identifier. Is your output a C program?

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